Crushing-mill



T. J. STURTEVANT:

CRUSHING MILL.

APPLICATION FILED JULY 11, 1917.

1,360,465. PatentedNov; 30,1920.

2 SHEETSSHEET 1.

A7 Wa /Wfiorney.

T. J. STURTEVANT.

CRUSHING MILL.

APPLICATION FILED JULY H, 1917.

Patented Nov. 30, 1920.

UNITED STATES THOMAS J. STURTEVANT, OF WELLESLEY, MASSACHUSETTS, ASSIGNOR TO STUBTEVANT MILL COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHU- CRUSHING-MILL.

Specification of Letters Patent.

Application fi1ed July 11, 1917. Serial No. 179,845.

To all whom it may concern:

Be it known that I, THOMAS J. STURTE? VANT, a citizen of the United States, residing at. Wellesley, county of Norfolk, and State of Massachusetts,-have invented an Improvement in Crushing-Mills, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts. I

The invention hereinafter described relates to crushing mills for reducing materials, and is of the general class shown in Letters Patent of the United States, No. 995,580, dated June 20, 1911; No. 1,000,457, dated August 15, 1911; and No. 1,105,713, dated August 4, 1914.

A mill of this class comprises a rotary anvil ring and crushing rolls mounted on carriers which are pressed by springs to force the rolls toward the inner face of the ring to crush a stream of material fed between them and held to said ringby centrifugal force.

The thickness of this stream of material varies and sometimes contains abnormally large lumps. As a consequence, the rolls are permitted to move toward and from the ring, according to the varying thickness and conditions of the stream of material. It is desirable to maintain substantially equal pressures on the rolls to produce uniform operation of the mill.

One of the objects of the invention is to produce simple and effective means for pressing the rolls yieldingly outward toward the inner face of the ring, for transmitting pressure from one roll to another, and for equalizing pressure on the rolls.

Another object of the invention is to provide a simple mechanism for supporting and pressing the rolls toward the ring with provision permitting ready access to the parts of the mill for purposes of inspection and repair.

With the aforesaid and other objects in view, the character of the invention will be best understood by reference to the following description of one good form of the invention shown in the accompanying drawings, wherein:

Figure 1 is a side elevation of the crushing mill shown herein as embodying the invention;

Fig. 2 is a vertical section through the mill shown in Fig. 1;

lg 1g. 3 is a front elevation of the mill; an

Fig. 4 is avertical section taken 0 4-4 of Fig. 2. H mm Referring to the drawings: The mill shown therein as embodying the invention comprises a base 1 supporting a casing 3 containing an anvil ring 5 having a concave inner crushing face 7 andmounted on a spider ,9 having a hub 11 fast on a shaft 13 ournaled in bearings in standards 15 mounted on said base. The shaft has a pulley 17 fast thereon which maybe driven by a belt (not shown) from a suitable source of power.

A plurality of crushing rolls 19 may be mounted withinthe ring in opposition to the inner face thereof to crush material fed between them. These rolls are journaled on carriers, in the present instance of the invention inv the form of shafts 21 projecting -laterally outward from the casing and mounted 111 boss bearings 23 integral with yokes 25 having ends journaled in bearings 27 mounted on the outer face of a head or door 29 movable to open and closed positions. To permit this movement of the door, it may be connected to the casing by hinges'31.

The roll carriers pivotally mounted on the door. as described will permit the rolls to move toward and from the inner face of the ring. Next will be described the means for pressing the rolls toward the ring. To,

accomplish this, a floating member common to the carriers is provided, in the present instance of the invention in the form of a ring 33 encirclingthe carriers and located adjacent the outer face of the door in a plane substantially parallel to the plane of the anvil ring. Suitable means may be provlded to support said member, and in the present instance this is accomplished by a link 35 *pivotally connected to said member adjacent the lower side thereof and projecting upwardly through an aperture in a rib or shoulder 37 on the door. This link is yieldingly supported by a coil spring 39 con Patented Nov. 30, 1920.

a link a3 pivotally connected thereto and projecting outwardly through a hole in the ring 33 sufliciently large to allow a certain amount of play of the link therein. A coil spring 45 encircles the link and is confined between a socket 47 on the outer periphery of the ring and a washer secured by a nut l9 on the link.

The construction is such that the springs, when properly ten'sioned, will react against the outer periphery of the ring and operating through their links, will draw the carriers outward and press the crushing rolls toward the anvil ring against the stream of material fed between them.

This ring will desirably serve to transmit pressure from one roll to another and tend to equalize the pressures thereon. For example, if an abnormally large lump passes between the upper crushing roll and the anvil ring, said roll will be moved inwardly, thereby causing its carrier to pull down on the link 4L3 and increase the tension on the spring 45. The latter will press more strongly against the ring 33 and thereby thrust it downward against the tension of its supporting spring 39, Downward movement of the ring will increase the tension on the springs 45 for the lower roll carriers and thereby increase the pressure of the lower rolls toward the anvil ring. S1milarly, if either of the lower rolls moves inwardly, the ring 33 will move upwardly, and thereby increase the tension on the spring for the upper roll and increase the pressure on the latter.

Gravity tends to move the upper roll downw rd away from the anvil ring and tends to pull the two lower rolls downward toward the anvil. It is desirable to provide all the rolls with equal pressures. The springs 45 acting on the carriers for the rolls may have their tension adjusted to compensate for the effect of gravity thereon. This would require the tension of the spring for the upper roll to be greater than the tension of the springs for the lower rolls. Y

It is desirable to limit the outward movement of the crushing rolls by the springs 45. To accomplish this, each of the links -13 may have a nut 50 thereon secured by a lock nut 5d and serving as a stop for engaging the inner surface of the ring to prevent movement of the crushing rolls outward beyond a predeterminedpoint.

The crushing rolls should be drawn outward against the inner face of the anvil ring with sufficientrforce, so that they will lightly engage said ring and enable the latter to have enough traction on'the rolls to rotate the same in starting the mill. The

stop nuts preferably are so adjusted that they will permit this light pressure of the rolls against the anvil ring, but will become effective to limit. substantial movement of said rolls outward beyond the ring when the door is open and the rolls are swung away from the ring.

The roll carriers project through elongated apertures 51 in the door and are provided with sliding plates 53 which follow the movements of the carriers, but are suthciently large to cover said apertures and prevent escape of dust therethrough.

To feed material to the mill, it may be provided with a hopper 55 delivering the material through a chute 57 mounted on the door to and between the anvil ring and one of the lower crushing rolls.

It will be noted that the rolls, their car riers. the eoualizing ring, its supporting spring, and the springs and links for pressing the crushing rolls outwardly toward the anvil ring, are all mounted on the door.

, its a result, the door may be readily opened,

thereby withdrawing the rolls from the in terior of the asing and exposing the anvil ring and parts carried by the door for con renicnt inspection, adjustment and repair.

It will be understood that the invention is not limited to the specificembodiment shown, but that various deviations may be made therefrom without departing from the spirit and scope of the appended claims.

hat is claimed is 1. A crushing mill comprising in combiinaion, an anvil ring, crushing rolls opposed to the inner face of said ring to crush material between them, carriers for e id. rolls, and means including an equalizing r located exteriorly of the anvil ring for transmitting pressure from one roll. to another.

2. A crushing mill comprising, in combination, an anvil ring, crushing rolls 0pposed to the inner face of said ring, carfor said rolls, and means including an equalizing ring encircling said carriers for transmitting pressure from one to another.

3. A crushing mill comprising, in combination, an anvil ring, crushing rolls opposed to the inner face of said ring, carriers for said rolls, an equalizing ring, and springs connected to said carriers and equalizing ring for pressing said rolls toward said anvil ring.

4. A crushing mill comprising, in combination. an anvil ring, crushing rolls opposed to the inner face of said ring, carriers for said rolls, and means including a floating ring for pressing said rolls toward said anvil ring.

A crushing mill comprising, in combination, an anvil ring, crushing rollsopposed to the inner face of said ring, carriers for said rolls, and means including 6. A crushing mill comprising, in combination, an anvil ring, crushing rolls opposed to the inner face of said ring, carriers for said rolls, a floating member disposed about said carriers, and spring means coiiperating with said floating member and carriers for pressing said rolls toward said ring. 1

7. A crushing mill comprising, in combination, an anvil ring, crushing rolls opposed to the inner face of said ring, carriers for said rolls, and means to press said carriers outward toward said ring including spring means and a floating member acting through said carriers and movable in a plane substantially parallel to the plane of said ring. v

8. A crushing mill comprising, in combination, an anvil ring, crushing rolls opposed to the inner face of said ring, carriers for said rolls, and means to press said carriers outward toward said ring including a floating member acting through said carriers and movable radially of said ring.

9. A crushing mill comprising, in combination, an anvil ring, crushing rolls opposed to the inner face of said ring, carriers for said rolls, a floating member disposed about said carriers, spring means cooperating with said floating member and carriers for pressing said rolls toward said ring, and means to support said member.

10. A crushing mill comprising, in combination, an anvil ring, crushing rolls opposed to the inner race of said ring, carriage for said rolls, a floating member, spring means cooperating with said floating member and carriers for pressing said rolls toward said ring, and spring means to support said member.

11. A crushing mill comprising, in combination, an anvil ring, crushing rolls opposed to the inner face of said ring, carriers for said rolls pivotally mounted to permit said rolls to swing toward and from said face, springs for pressing said carriers outward toward said ring, and a ring for positioning said springs.

12. A crushing mill comprising, in combination, a casing having a movably mounted door, an anvil ring in said casing, crushing rolls opposed to the inner face of said ring, carriers for said rolls mounted on said door, a ring carried by said door, and springs cooperating with said ring and carriers for pressing the rolls toward said anvil ring.

13. A crushing mill comprising, in combination, an anvil ring, crushing rolls opposed to the inner face oi? said ring, carriers for said rolls, an equalizing ring, links connected to said carriers, and springs cooperating with said equalizing ring and links for pressing said crushing rolls outward toward said anvil rin 14. Acrushing mill comprising, in combination, I a casing having a door hinged thereon, an anvil ring mounted in said casing, crushing rollsopposed to the inner face of said ring, carriers for said rolls, an equalizing ring, and springs cooperating with said equalizing ring and carriers for pressing the rolls toward said anvil ring, said rolls, their carriers, said equalizing ring and springs being mounted on and movable with said door.

15. A crushing mill comprising, in combination, an anvil ring, crushing rolls opposed to the inner face of said ring, carriers for said rolls, an equalizing ring, means including a link and spring to support the said equalizing ring, and springs cooperating with the latter to press the rolls toward said anvil ring.

16. A crushing mill comprising, in combi-, nation, a casing having a movably mounted door, an anvil ring in said casin crushing rolls opposed to the inner face 0 said ring, carriers for said rolls mounted on said door, an equalizing ring for said carriers, a link connected to the equalizing ring, a spring mounted on said door supporting said link, and springs cooperating with said equalizing ring and carriers for pressing the rolls toward said anvil ring.

17. A crushing mill comprising, in combination, a vertical anvil ring, crushing rolls opposed to the inner face of said ring, pivotally mounted carriers for said rolls project ing laterally outward beyond said ring, an equalizing ring movably supported adjacent said carriers, and springs coiiperating with said equalizing ring and carriers for pressing said rolls toward said anvil ring.

18. A crushing mill comprising, in combination, an anvil ring, a support therefor rotatable on a fixed axis, crushing rolls opposed to the inner face of said ring, pivotally mounted carriers for said rolls, a ring encircling said carriers, and springs cooperating with said ring and carriers to press the rolls toward said anvil ring.

19. A crushing mill comprising, in combination, an anvil ring, crushing rolls opposed to the inner face oi said ring, carriers for said rolls, an equalizing ring adjacent said carriers, spring means yieldingly connecting said equalizing ring and carriers for pressing said rolls outv 'ard toward said anvil ring, and stop means cooperating with said equalizing ring to limit said outward movement of said rolls.

20. A crushing mill comprising, in combination, an anvil ring, crushing rolls opposed to the inner face of said ring, a casing for said ring, a door for said casing carrying said rolls, an equalizing ring movably mounted adjacent said door, springs cooperating with said equalizing ring to press said rolls outward toward said anvil ring, and means to limit outward movement of said rolls when said door is open.

21. A crushing mill comprising, in combinetion, an anvil ring, crushing rolls 0pposed to the inner face of said ring, carriers for said rolls, an equalizing ring adjacent said carriers, spring means forming Connections between the equalizing ring and carriers for pressing the rolls outward 10 toward said anvil ring, and means-to limit the outward movement of said rolls.

In testimony whereof I have signed my name to this specification.

THOMAS J. STURTEVANT. 

